Guys, nowhere else to put this and you'll know:
In America, directional Yagi antennas are used for news choppers to aim the antennas together. Does the same happen here, or are the choppers pumping out an omni-directional signal? This comes about after I saw this posted on Reddit (the article and the signal processing parts are great):
https://twitter.com/d0tslash/status/1266542886184779776?s=20
I was wondering if it was at all possible for me to pick up a signal from the news choppers but so many things would have to line up right, having an SDR that can do it, having the software and parameters to demodulate the signal, etc etc. That's what led to the question about whether we use omnis here, because if we don't then the chances of me picking anything up would be, in theory, very difficult, as the Rx and Tx are aiming at each other and not at me.
It was my understanding that choppers sometimes use omnis to go back down to a truck for satellite hopping, but around cities the main networks have receive points, hence the question.